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| Case Size | 40mm, 44mm | 38mm, 42mm |
| Display Area | 759 sq mm or 977 sq mm display area | 563 sq mm or 740 sq mm display area |
| Case Thickness | 10.7mm | 11.4mm |
| Processor | 64-bit dual-core S4 processor; Up to 2x faster than S3 processor | Dual-core S3 processor |
| Electrical Heart Sensor | Electrical heart sensor (ECG app); ECG app coming later this year | |
| Optical Heart Sensor | Second-generation optical heart sensor | Optical heart sensor |
| Fall Detection | 
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| Digital Crown | Digital Crown with haptic feedback | Digital Crown |
 - Silver Aluminium Case with Seashell Sport Loop ){kind=link}
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